Quote Originally Posted by RickooClan
I think you couldn't say the Civ 4 AI is one of the most difficult but Civ 4 is difficult, beacuse the AI cheat.

The AI itself is not difficult but the game is, because it cheats.
That's a good point. However, after the BTS expansion pack, even the non-cheating AI is very good. It has a rational diplomacy system, it defends its cities well, develops its cities well, and attacks appropriate targets with sufficient forces to take and hold them. All the things that the TW AI should be doing. It's no match for an experienced human player, but that's not so much due to the AI's flaws as its inability to grasp most of the very advanced strategies that humans can come up with.